MacwascyclingalongaroadinCanada’sYukon,halfwaythrougha2...
问题详情：MacwascyclingalongaroadinCanada’sYukon,halfwaythrougha2,750-milebiketourtoPrudhoeBay,Alaska.Hewascarryinga30-poundcampingbag,__41__hewasn’tmovingveryfast.Suddenly,heheardloudbreathingbehindh...